Ignitron Mercury Pool Tube from Japan
Ignitrons are high-current mercury pool gas tubes for welding control and electrolytic processes, igniting mercury vapor arc for conduction. They qualify under HTS 8540.89.0020 as vapor electron tubes.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Hazardous material declaration mandatory due to mercury pool content
• Specify current rating (>1000A typical) to distinguish from lower-power tubes
• Mounting flange dimensions affect packaging classification